Cisco Systems, Inc. v. TQ Delta, LLC

TQ’s patent, entitled “Multicarrier Transmission System with Low Power Sleep Mode and Rapid-On Capability,” relates to the field of “multicarrier transmission systems” that provide high speed data links between communication points [and have recently been used] . . . for communications over the local subscriber loop that connects a telephone service subscriber to a central telephone office.” The patent generally describes a method for “establishing a power management sleep state in a multicarrier system” and efficiently waking up a transmission system utilized on hardware, such as a computer, from sleep mode. Cisco and Arris sought inter partes review (IPR). The Patent Trial and Appeal Board found that the claims were not unpatentable over a combination of the prior art. In the meantime, in a companion case, the Federal Circuit held that claims 6, 11, 16, and 20 would have been obvious. The Federal Circuit held that an appeal with respect to those claims is moot. The court vacated with respect to the remaining claims being challenged. The Board incorrectly construed illustrative claim 6’s term “synchronization signal” to mean “a signal allowing synchronization between the clock of the transmitter of the signal and the clock of the receiver of the signal.” View "Cisco Systems, Inc. v. TQ Delta, LLC" on Justia Law